<?php $fields = $form->getFormFieldSchema(); ?>
<form action="<?php echo url_for('@signin') ?>" method="post">
  <table>
    <tbody>
    <?php echo $form->renderHiddenFields(false); ?>
      <tr>
      <td><?php echo $form['username']->renderLabel('Usuario') ?></td>
      <td><?php echo $form['username']->render() ?></td>
     </tr>
      <tr>
      <td><?php echo $form['password']->renderLabel('Contraseña') ?></td>
      <td><?php echo $form['password']->render() ?></td>
      </tr>
    </tbody>
    <tfoot>
      <tr>
        <td colspan="2">
          <input class="submit" type="submit" value="Ingresar" />
        </td>
      </tr>
    </tfoot>
  </table>
</form>
